file chooser: Allow activating without double-click
file chooser: Allow activating without double-click

Interpret a unmodified primary click on the selection like a double
click. This makes it possible to activate a file or open a folder
without using double-click.

davidgumberg/gtk,jigpu/gtk,chergert/gtk,davidgumberg/gtk,grubersjoe/adwaita,davidgumberg/gtk,alexlarsson/gtk,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk,chergert/gtk,chergert/gtk,jadahl/gtk,jigpu/gtk,davidgumberg/gtk,jigpu/gtk,jigpu/gtk,davidgumberg/gtk,chergert/gtk,grubersjoe/adwaita,jadahl/gtk,grubersjoe/adwaita,jadahl/gtk,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,alexlarsson/gtk,jadahl/gtk,chergert/gtk,jadahl/gtk,jigpu/gtk,chergert/gtk,chergert/gtk,jadahl/gtk,jadahl/gtk,grubersjoe/adwaita,grubersjoe/adwaita,alexlarsson/gtk,jigpu/gtk,davidgumberg/gtk,grubersjoe/adwaita,grubersjoe/adwaita,alexlarsson/gtk,davidgumberg/gtk,alexlarsson/gtk